Frequencies for length variable in fhouse2000 dataset :

     format |
     length |      Freq.     Percent        Cum.
------------+-----------------------------------
          4 |          1        1.05        1.05
          7 |         13       13.68       14.74
          9 |          9        9.47       24.21
         15 |         13       13.68       37.89
         21 |          7        7.37       45.26
         25 |         22       23.16       68.42
         28 |          6        6.32       74.74
         29 |          3        3.16       77.89
         38 |          8        8.42       86.32
         46 |         13       13.68      100.00
------------+-----------------------------------
      Total |         95      100.00

by Jean Roth , jroth@nber.org , 10 May 2016